Author Topic: nSDL 1.1.1 Anniversary Edition—The Ultimate TI-Nspire Graphics Library  (Read 69909 times)

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Offline atiatinini

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Re: nSDL (0.1.4 beta)
« Reply #135 on: March 27, 2012, 04:20:23 pm »
Won't all of these relocation issues be fixed if we use an elf/bFLT/QEMU loader? :)
« Last Edit: March 27, 2012, 04:25:17 pm by atiatinini »

Offline ExtendeD

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Re: nSDL (0.1.4 beta)
« Reply #136 on: March 27, 2012, 04:55:03 pm »
Maybe.

 atiatinini, hoffa, which version of YAGARTO/Newlib are you respectively using?
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Offline hoffa

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Re: nSDL (0.1.4 beta)
« Reply #137 on: March 27, 2012, 05:03:22 pm »
binutils: 2.21
gcc:      4.6.2
newlib:   1.19.0
gdb:      7.3.1

BTW, atiatini, meanwhile you could use the fast inverse square root function (used in Quake for example):

float inv_sqrt(float x) {
   union {
      float x;
      int i;
   } u = {x};
   u.i = 0x5f3759df - (u.i >> 1);
   return u.x * (1.5f - (0.5f * x * u.x * u.x));
}


It's quite "hackish", but just do 1/inv_sqrt() and you have an accurate and a very fast approximation of the square root.
« Last Edit: March 27, 2012, 05:09:41 pm by hoffa »

Offline atiatinini

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Re: nSDL (0.1.4 beta)
« Reply #138 on: March 27, 2012, 05:14:44 pm »
Thanks, I'll use those "alternative methods" then. :)

Offline ExtendeD

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Re: nSDL (0.1.4 beta)
« Reply #139 on: March 27, 2012, 05:27:54 pm »
I'd prefer that both of you contribute to find out the root cause of the issue.
atiatinini, if you are trying to port SDL programs, you'll probably encounter other conflicts more difficult to identify and work around.
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Offline hoffa

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Re: nSDL (0.1.4 beta)
« Reply #140 on: March 27, 2012, 05:35:09 pm »
I'd prefer that both of you contribute to find out the root cause of the issue.
I'll have a more thorough look at it tomorrow (or whenever I have the time). I checked newlib's sqrt() implementation (I'm pretty sure that's the one used), and there doesn't seem to be any global variable stuff that could cause issues.
« Last Edit: March 27, 2012, 05:38:48 pm by hoffa »

Offline atiatinini

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Re: nSDL (0.1.4 beta)
« Reply #141 on: March 27, 2012, 05:52:03 pm »
I'd prefer that both of you contribute to find out the root cause of the issue.
atiatinini, if you are trying to port SDL programs, you'll probably encounter other conflicts more difficult to identify and work around.
Yes, there are a few things that doesn't seem to work with Ndless, like srand(int) and rand();

Offline ExtendeD

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Re: nSDL (0.1.4 beta)
« Reply #142 on: March 28, 2012, 04:08:03 am »
The source code of Newlib's sqrt is this one:

http://sourceware.org/cgi-bin/cvsweb.cgi/src/newlib/libm/math/w_sqrt.c?annotate=1.1.1.1&cvsroot=src

_LIB_VERSION refers to the global variable __fdlib_version, I'm not sure why but it seems to require relocation, which cannot be provided by Ndless.
It actually doesn't work well without nSDL, it's just that the random access to memory falls to a valid address (but still not __fdlib_version).
I'm afraid we cannot trust any Newlib function without a full-featured relocator.
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Offline hoffa

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Re: nSDL (0.1.4 beta)
« Reply #143 on: March 28, 2012, 09:26:01 am »
The source code of Newlib's sqrt is this one:

http://sourceware.org/cgi-bin/cvsweb.cgi/src/newlib/libm/math/w_sqrt.c?annotate=1.1.1.1&cvsroot=src

_LIB_VERSION refers to the global variable __fdlib_version, I'm not sure why but it seems to require relocation, which cannot be provided by Ndless.
It actually doesn't work well without nSDL, it's just that the random access to memory falls to a valid address (but still not __fdlib_version).
I'm afraid we cannot trust any Newlib function without a full-featured relocator.
Can't Newlib "just" be recompiled with some nl_relocdata hacking meanwhile?

Offline ExtendeD

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Re: nSDL (0.1.4 beta)
« Reply #144 on: March 28, 2012, 09:30:34 am »
I suppose this would require some effort. And for example I don't understand why _LIB_VERSION would require nl_relocdata, so identifying what needs to be patched isn't clear to me.
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Offline hoffa

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Re: nSDL (0.1.4 beta)
« Reply #145 on: March 28, 2012, 10:38:11 am »
I'll try and port (wait, no, I will port) fdlibm (actually I think that's what newlib partly uses); it would be a nice add-on with the next nSDL release.

EDIT:

I compiled the fdlibm sqrt routine codes with _IEEE_LIBM and __LITTLE_ENDIAN defined, and it works nicely:



The "inside *" messages are there to prove that it is indeed using the new functions and those of the math lib magically included by GCC.
Maybe the same trick could be blindly used on newlib's libm code (which should be pretty much the same).

PS: It seems that GCC includes libm even without -lm, how do I force it not to use any libraries? Using -nostdlib with ld-nspire just makes it vomit all kinds of __aeabi_* errors.

EDIT2: I did a few changes and compiled fdlibm; it should implement all functions in <math.h> and it also contains the macros (were added from newlib's <math.h> manually). If it works well it could be a more or less lightweight replacement to newlib's libm.a. Library's attached.
« Last Edit: March 28, 2012, 02:36:56 pm by hoffa »

Offline hoffa

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Re: nSDL (0.1.4 beta)
« Reply #146 on: March 29, 2012, 04:48:29 pm »
I managed to get the mouse to work, at least to some degree. Some very weird bug shuts down the program at seemingly random moments, as you can see:



EDIT: After numerous tests it seems that it crashes (or whatever happens) if the mouse goes to the y-coordinate 9. I see no logical explanation for this bug.
« Last Edit: March 29, 2012, 05:12:33 pm by hoffa »

Offline ExtendeD

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Re: nSDL (0.1.4 beta)
« Reply #147 on: March 31, 2012, 04:15:52 am »
I've looked closer if anything could be done for the relocation issue. Global variables containing data which need to be relocated are stored in the 'data.rel' section of the ELF file, but this doesn't mean we can blindly relocate anything in this section, since there may also be fields not to be relocated. The relocation info cannot be emitted to the binary file and the current Ndless relocator cannot do much about it.

I'd like to see if tangrs's relocator ( http://ourl.ca/15714 ) would fix all these issues.
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Offline hoffa

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Re: nSDL (0.1.4 beta)
« Reply #148 on: April 03, 2012, 08:00:18 am »
Just to give you a quick heads up, the next version--0.2.0--and rather major step, will have numerous changes. Among those will be mouse support, 8 BPP support for CX (thanks to atiatini for the idea; makes it possible to port 8 BPP programs for the CX), many font-related changes (if you're the observing type you can notice one thing on the screenshot below) and a lot of under-the-hood modifications (performance, stability, etc.). Also a few surprises. Quick screenshot to show 16 BPP and palettized 8 BPP on CX (actually it's just an excuse to give the thread some color):

« Last Edit: April 03, 2012, 08:04:02 am by hoffa »

Offline Lionel Debroux

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Re: nSDL (0.1.4 beta)
« Reply #149 on: April 03, 2012, 08:19:52 am »
Looks good, as usual :)

Quote
8 BPP support for CX (thanks to atiatini for the idea; makes it possible to port 8 BPP programs for the CX),
FWIW, while their screen sucks beyond usability, the Clickpad & Touchpad models do support 8 bpp, as shown by nDOOM :)

Quote
many font-related changes (if you're the observing type you can notice one thing on the screenshot below)
Transparency ?
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